A lot of times, since there are shades of gray in Lucha, it depends on who you are feuding with.

A rudo can be turned tecnico, at least for a night, if he is fighting a more hated rudo. This is probably best exemplified by "Mexico vs. [country x], where even the Los Guapos or Cien Caras/M2k/U2K would be tecnicos against Los Boricuas or the New Japan guys and Black Tiger.